mirror of
https://github.com/danbee/unicorn
synced 2026-06-20 22:52:22 +00:00
27 lines
888 B
Diff
27 lines
888 B
Diff
diff --git a/src/rp2_common/pico_standard_link/crt0.S b/src/rp2_common/pico_standard_link/crt0.S
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index d061108..864d31f 100644
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--- a/src/rp2_common/pico_standard_link/crt0.S
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+++ b/src/rp2_common/pico_standard_link/crt0.S
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@@ -10,6 +10,8 @@
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#include "hardware/regs/sio.h"
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#include "pico/asm_helper.S"
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#include "pico/binary_info/defs.h"
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+#include "hardware/regs/resets.h"
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+#include "hardware/regs/rosc.h"
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#ifdef NDEBUG
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#ifndef COLLAPSE_IRQS
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@@ -226,6 +228,12 @@ _reset_handler:
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cmp r0, #0
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bne hold_non_core0_in_bootrom
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+ // Increase ROSC frequency to ~48MHz (range 14.4 - 96)
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+ // Speeds up memory zero init and preinit phases.
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+ ldr r0, =(ROSC_BASE + ROSC_DIV_OFFSET)
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+ ldr r1, =0xaa2
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+ str r1, [r0]
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+
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// In a NO_FLASH binary, don't perform .data copy, since it's loaded
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// in-place by the SRAM load. Still need to clear .bss
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#if !PICO_NO_FLASH
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